Avoid creating a RenderWidgetHostView for proxies.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index a36899d89a1a40ac84a6d126fc31508432fedd49..23e77462aad539c5bfee09663337864299e5cff5 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -80,9 +80,6 @@ struct ResourceResponse;
 enum CreateRenderFrameFlags {
   // The RFH will be initially placed on the swapped out hosts list.
   CREATE_RF_SWAPPED_OUT = 1 << 0,
-  // The new RenderFrame is being created for a navigation of the
-  // top-level frame.
-  CREATE_RF_FOR_MAIN_FRAME_NAVIGATION = 1 << 1,
   // The RenderFrame is initially hidden.
   CREATE_RF_HIDDEN = 1 << 2,

[Charlie Reis, 2015/08/28 18:58:26]

I don't think these enum values are serialized or exposed anywhere, are they? 
Maybe we should shift them over.

[lfg, 2015/08/28 21:18:40]

Done.

   // The RenderFrameHost will have a new RenderWidgetHost created and